| http://www.w3.org/ns/prov#value | - hem, form a cyclic ring; preferably, R14, R15 and R16 are identical and are a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a CF3 group, a C6-C8 aryl group, a C6-C10 fluoroaryl group, more preferably a pentafluorophenyl group, a C1-C4 alkoxy group, in particular a methoxy group, a C2-C4 alkenyl group, a C7-C10 arylalkyl group, a C8-C12 arylalkenyl group, or a C7-C14 alkylaryl group; or, R7 i
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